Any glazing material used in fire doors is required to be:

• A. Fire rated
• B. Clear glass
• C. Tempered glass
• D. Laminated glass

Answer: (A)

Glazing in fire doors must be fire-rated. A fire door is tested as an assembly to resist flame, heat, and smoke for a specific duration, and the glass used in that door must carry a fire-resistance rating and labeling that matches the door’s rating. If the glazing isn’t fire-rated, it can fail or fail open under fire conditions, allowing heat and flames to pass through. Standard clear glass, even if it’s tempered or laminated, does not automatically meet the required fire resistance unless it is specifically manufactured and labeled as fire-rated glazing. So the essential requirement is that the glazing be fire-rated.